The Blu-Ray player in the PS3 is about the best you can buy. I think it was like the the top 3 rated players. If you are buying a Blu-Ray player anyway, then yes, get the PS3. It is without a doubt the best value.
If Blu-Ray is just the added bonus, as it is for me, then it really decided on -
A) What games you like more
B) What you want to do with the games you like
If you are into online, co-op, team or group play The XBOX 360 just flat out kills the PS3 in it's online gaming.
However, if you are just the casual online gamer, the PS# network will do fine and unlike the 360, it is free ... for now.
The PS3 has, to me, the best exclusives however.
360 has -
HALO
GEARS OF WAR
and that new ALAN WAKE game I want to play (looks cool)
But the PS3 dominates with -
UNCHARTED (BEST GAME EVER
)
GOD OF WAR
RESISTANCE
INFAMOUS
RATCHET AND CLANK
LITTLE BIG PLANET
And hopefully soon ... HEAVY RAIN
I say, for the money, PS3 is easy.